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Somatic reversion of strains with the ivory (wi) allele, a mutation associated with a tandem duplication of a DNA sequence at the white locus, increased with the age of larvae at the time of X-irradiation as expected from the increase in the number of target cells. In contrast, two independently isolated strains with unstable w  + loci associated with insertion of transposable elements showed higher reversion frequencies after treatment with X rays or ethyl methanesulfonate (EMS) at early larval stages than at late stages. Nevertheless, both the wi strain and the two unstable w  + strains reverted at nearly equal rates after treatment with X rays or EMS at early larval stages. Possible similarity in "hot spot" structure for the high reversibility of the two types of mutations is discussed in relation to production of presumed "mutator-type" cofactors specific to the transposon-caused mutations at early larval stages.

genetics

COMPARISON OF SOMATIC REVERSIONS BETWEEN THE IVORY ALLELE AND TRANSPOSON-CAUSED MUTANT ALLELES AT THE WHITE LOCUS OF DROSOPHILA MELANOGASTER AFTER LARVAL TREATMENT WITH X RAYS AND ETHYL METHANESULFONATE